George a



(ModeL) G. A. CARD-WELL 8v N.,L.-NORTH.

Telephone 0311 3611 or Alarm. No. 240.383.

Patented April 19,188I.

fill/61150135 MPETERS, PHOTLLLITHOGRAPHER. WASHINGTON. n C.

UNITED STATES PATENT OFFICE.

GEORGE A.

OARDWELL AND NELSON L. NORTH, OF BROOKLYN, N. Y.

TELEPHONE CALL-BELL OR ALARM.

SPECIFICATION formingpart of Letters Patent No. 240,383, dated April 19, 1881. Application filed November 13, 1880. (Model) To all whom it may concern:

Be it known that we, GEORGE A. GARD- WELL and NELSON L. NORTH, of Brooklyn, in the county of Kings and State of New York,

' as joint inventors, have invented a new and Improved Call or Signaling Apparatus for Telephone or Telegraph Lines and and We do hereby declare that the followingis a full, clear, and exact description of our said invention, reference being had to the annexed drawings, forming part of this specification, and to the several figures and letters of reference maked thereon.

The nature of our invention relates to callbells or alarms placed upon a single electric circuit, and so operated that any particular office or person upon such circuit may be called without disturbing or calling any of the other offices or persons upon the same circuit.

The object of our invention is to enable many offices to be placed upon the same telephone or telegraph circuit, and placed in communication, at option, any one with any other, without disturbing, calling, or alarming others on same circuit.

The utility of our invention consists in being able to dispense with the cen tral-office system and its attendant expense.

The following is a description of our said invention and the mode of its operation; and, in order that a clear understanding may be had of the features of the invention and the mode of its operation, we first indicate, by reference to the drawings, and the figures and letters thereon marked, the names of the different parts of the said apparatus.

Figures 1, 2, 3, 4represent front views of the mechanism of the apparatus, a. portion of the cover or face in Fig. 1 being removed that the internal arrangements be better understood and seen. Fig. 5 represents a side view of the mechanism of Fig. 1; Fig. 6, view of nameslip Fig. 7, side view of the lower portion of Figs. 2 and 3.

The detailed portions of the several figures are as follows, to wit:

Fig. 1: A is the index-hand B, dial-plate G, the great wheel; D, the pin-wheel 5 E, the pinion of the ratchet-wheel; F, the ratchetwheel; G, the escapement, H, the escapement-lever.

Circuits;

Fig. 2: I is the capement-wheel contact-lever.

Fig. 3: N N are the contact-points; O, the electric bell; P, the electro-magnet operating the same; Q, the wires of local circuit.

Fig. 4.: R is the line electro-magnet; S, its lever and armature; T, the screw-cups to which the line wires are attached U, adjustingspring.

Fig. 5, (side view of Fig. 1, same letters of reference A, is theindex-hand B, dial-plate; G, great wheel; D, pin-wheeel; E, pinion of ratchet-wheel F, the ratchet-wheel.

X represents a guard-key and chain, to prevent an operator passing the desired person by carelessness.

Fig. 6 shows name-slip, before indicated.

Fig. 7, (side view of parts of Fig. 2, same letters of reference M is the contact-lever; N N, contact-points.

The operation of this apparatus is as follows: The line on which an electrical current is circulating by means of a proper line-battery is connected through the line electro-maguet R. The operator, by manipulating any key or circuit-breaker in said line, causes the electromagnet to move its armature up and down, which motion, by the levers S H, works the escapement G. The escapement-wheel thereupon rotates step by step on well-known principles, and by means of the pinion E on its axis rotates the great wheel 0. Now, the pin-wheel D, being on the same axis as the great wheel 0, rotates with it. The pin-wheel D is provided with a pin in a different place on its face or circumference at each different station or office on the line. (Such pin can be made movable to save expense in changing instruments, or the great wheel on either face can be made to do the duty as pin-wheel, such being indicated as optional methods.) When the pin-wheel, by its rotation,presscs the pin upon the end of the pivoted lever I it lifts the other end out of the detent of the wheel K. The clock-work now revolves by the force of the coiled spring, and if sufficient length of time were allowed to elapse the revolution of the clock-work wheels would bring the contact-lever M, which is connected suitably with one of the axes of the train, against the contact-points NN of the 10- pivoted lever K, the es- L, the clock-work; M, the

cal or electric-bell circuit and force them together, ringing the bell. If, however, this is not desirable, by reason that the clock-work of a person not wanted is started, the operator does not cease manipulating the key, but, continuing the operation of the apparatus, carries the pin past the lever, which, again falling back, arrests the clock-work almost as soon as started. When, however, the clock-work of the station wanted is started, the operator ceases his inanipulation a sufficient length of time for the hell of the desired station to ring.

In order that an operator may know where the pin of the pin-wheel is in its rotation, a hand and dial-face are added.

Each station upon the electric circuit is provided with one of these instruments in addition to the usual other apparatus.

To return the instruments to zero after use the same manipulation is used as to call any particular person.

What we claim,

and desire to secure by Letters Patent, is-

1. The combination of the great wheel 0, pinion E, pin-wh eel D, pivoted lever I, contactlever M, and contacts N with a train of clockwork, substantially as described, a local electromagnetic alarm, controlled through the medium of said clock-work, and an electromagnetic detent, through which the clock-work is controlled, substantially as and for the purpose set forth.

2. In atelephonic or telegraphic call or alarm, the combination, with the clock-work mechanism under electromagnetic control, substantially as described, of the local electromagnetic call or alarm, the contacts N N, and the contact-lever M, substantially as and for the purpose set forth.

GEORGE A. OARDWELL. NELSON L. NORTH.

Witnesses:

J. MILTON STEARNS, J r., J OHN M. STEARNS. 

